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Old 06-07-2017, 12:05 PM   #1
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Pulsating hot water

We took the rig for her shakedown last weekend. When using the water pump, the bathroom shower and sink pulsates warm to cool. Kinda weird, you can hear the pump run, then stop, then run, etc... This goes back and forth and along with that the water gets cool then warm. Has anyone experienced this yet? Any ideas on how to correct this?
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Old 06-07-2017, 12:30 PM   #2
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Make sure the bypass valve at the water heater is closed. This is the valve that goes between the hot and cold water lines (should only be open for winterizing).
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Old 06-07-2017, 12:50 PM   #3
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HW bypass is closed. Plenty of hot water. It just pulsates in the bathroom. Now the kitchen sink, stays an even temperature. The sink has a single valve that you turn to adjust the water temperature
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Old 06-07-2017, 02:00 PM   #4
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Make sure outside shower valves are closed
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Old 06-07-2017, 02:27 PM   #5
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You are always going to get some change in pressure while using the stock water pump. They are adjustable, but are usually set for 30 psi on and 50 psi off. The expensive fix is to install a variable speed water pump. The cheep fix is to install an accumulator in the output line from the water pump. The longer pipe run to for the hot water to the faucet is responsible for the temper change at the mixing valve. Low water pressure and the water heater restriction (piping) means less hot water and more cold water.
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Old 06-07-2017, 03:20 PM   #6
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Originally Posted by Beau388 View Post
You are always going to get some change in pressure while using the stock water pump. They are adjustable, but are usually set for 30 psi on and 50 psi off. The expensive fix is to install a variable speed water pump. The cheep fix is to install an accumulator in the output line from the water pump. The longer pipe run to for the hot water to the faucet is responsible for the temper change at the mixing valve. Low water pressure and the water heater restriction (piping) means less hot water and more cold water.

This is kind of wbat I was thinking, except the water temp pulsates warm to cool, the pressure is fine The kitchen sink is a single valve and the temp stays steady. My old rig didn't do this. Most Thor owners have this issue with similar models?
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Old 06-07-2017, 03:55 PM   #7
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You can also add an accumulator tank for RVs, helps a lot, I have virtually zero pulsation from my faucets! While you're at it add the silencing kit also, I think you'll be happy with the results. Both the accumulator and silencing kit can be ordered from Amazon are easy to install.
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Old 06-08-2017, 12:40 AM   #8
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Adding an accumulator to our water pump eliminated the annoying pulse. Easy DIY fix.
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Old 06-08-2017, 01:32 AM   #9
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I will check on the accumulator, thanks!
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Old 06-08-2017, 01:56 AM   #10
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Originally Posted by SuperD View Post
You can also add an accumulator tank for RVs, helps a lot, I have virtually zero pulsation from my faucets! While you're at it add the silencing kit also, I think you'll be happy with the results. Both the accumulator and silencing kit can be ordered from Amazon are easy to install.
Super D I had an accumulator in the Vegas but what is a silencing kit?
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Old 06-08-2017, 02:02 AM   #11
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The silencing kit consists of two hoses to replace the hard plastic and isolate the vibrations. Basically they are the same kind of hose that hooks up your home toilet and sinks plus a couple of adapters. Here is a picture:

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Old 06-08-2017, 02:07 AM   #12
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Here are before and after pictures of my pump. I made my own hoses because I had the parts. You can see the accumulator tank in the middle.

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Hope this helps!
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Old 06-08-2017, 02:17 AM   #13
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Originally Posted by SuperD View Post
Here are before and after pictures of my pump. I made my own hoses because I had the parts. You can see the accumulator tank in the middle.

Attachment 5192

Attachment 5193

Hope this helps!
Thanks so much big help pics are great. Windsport is supposed to be in next week I have the accumulator tank from the Vegas and will order silencing kit now.
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Old 06-08-2017, 02:22 AM   #14
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Thanks so much big help pics are great. Windsport is supposed to be in next week I have the accumulator tank from the Vegas and will order silencing kit now.
Bet you're getting excited! Please don't forget to post pictures!!!
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Old 06-08-2017, 03:29 AM   #15
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Bet you're getting excited! Please don't forget to post pictures!!!
Yes we are, we have been waiting since Feb.

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Old 06-08-2017, 10:07 AM   #16
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Kev I don't know where your water pump will be located, ours is under the dinette seat. I added a simple divider under the seat which gives me a good extra storage place.

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